Self-closing valve.



No. 711,349. Patent ed on. l4, I902.

V E. SCHLAEPFEB.

SELF CLOSING VALVE.

(Application filed June 9, 1902.) (No Model.)

W1 TNESSES: [NI/ENTOR m: Noam: PEYFRS co worn-mac WASHINGTON, qc.

UNTTED STATES PATENT @FFTCE.

EDOUARD SCHLAEPFER, OF LAUSANNE, SWITZERLAND.

SELF-CLOSING VALVE.

SPECIFICATION formingpart of Letters Patent No. 71 1,349, dated October 14, 1902.

Application filed June 9,1902.

To all whom it may concern.-

Be it known that I, EDOUARD SCHLAEPFER, a citizen of the Republic of Switzerland, residing at Lausanne, Switzerland, have invented certain new and usefulImprovements in Self- Olosing Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates toself-closing valves having a drilled inlet-valve opening toward the interior of the valve-casing and a counterpressure chamber situated behind the same, from which chamber a relief-passage closed by a relief-valve opening from the outside runs outward, the reclosing of the raised relief-valve thus insuring the tendency of the inlet valve when open to press strongly against its seat.

In the accompanying drawing a form of the invention is illustrated, the self-closing valve being represented in section.

a is the inlet, and b the outlet, of the valvecasing c, which contains the inlet valve d, provided With a packing-ring e and at the op posite end with a sleeve-piston f. The crosssectional area of the piston f is greater than that of the inlet-opening controlled by the valve. The inlet-valve d has an axial channel through which a spindle g is inserted. On one end of this spindle is the plate 72, which is held in permanent contact with the relief-valve 70 by means of a spiral spring 1}. A conduit a, controlled by the valve 70, leads to the outlet 6. The spindle g does not fit tightly in the bore of the valve, but has some play therein, leaving an annular passage, so that liquid under pressure can pass from the inlet a into the space Z behind the piston.

The action of the self-closing valve is as follows: In the condition of rest the liquid under pressure acts as well directly on the front end of the inlet-valve as through the bore of the same on the face of the pistonf, which is turned away from the inlet a, so that in consequence of the excess of pressure on the piston f due to its greater area the inlet-valve remains closed. If the valve-rod m be now pressed in order to open the reliefvalve 70, the counter-pressure chamber 1 will be emptied through the pipe it into the outlet Serial Noll0,830. (No model.)

b, as more liquid can flow away in a given time through this pipe by reason of its greater capacity than can enter into the counterpressure chamber l through the bore of the inlet-valve d. In consequence of this the inlet-valve (l is forced from its seat under the pressure of the liquid acting directly on the front end thereof until the opposite end of the inlet-valve strikes against the plate 72,, which rests on the relief-valve 7t, and the liquid under pressure can flow away through the outlet 1).

In consequence of the inlet-valve in its open position having under the influence of the liquid under pressure a strong tendency to press the relief-valve onto its seat the reclosing of the same is assured as soon as pressure is removed from the relief-valve rod m, as the counter-pressure chamber fills again gradually with liquid which enters through the bore of the inlet-valve d, forcing the valve to its seat.

It is important that the relief-valve should reliably close again, as the counter-pressure chamber otherwise could not fill with liquid, and consequently the closing of the inlet a by the inlet-valve would not be effected.

By the reciprocating action of the inletvalve d on the spindle g, connected with the plate h, in connection wherewith the spring i acts to prevent the spindle from becoming fixed in the bore of the inlet-valve, this bore is kept clean, so that a stoppage of the same by anyimpuritiesin the liquid under pressure is prevented as far as possible. This is important, for the reason that in the event of any stoppage of this boring taking place the liquid would act only insufficiently or not at all on the pistonfto effect the closing of the inlet-valve, and the latter would not close tightly. 7

Having now particularly described and ascertained the nature of my said invention and in what manner the same isto be performed, I declare that what I claim is 1. A valve comprising a casing provided with ingress and egress openings,a main valve in the forward portion of the casing and seated upon the ingress-opening and having an axial channel therethrough, a plunger-stem loosely disposed Within and guided by said channel, a plunger head or plate carried upon the rear ICO end of said stem, a reliefchannel leading from the interior of the casing at the rear of the valve to the egress-opening, a relief-valve con trolling the relief-channel,means for holding the plunger-head in pressure contact with the relief-valve thereby to close the same, and an eXteriorly-operable plunger whereby the relief-valve may be opened.

2. A valve comprising a casing provided with ingress and egress openings, a main valve controlling the ingress-opening and of larger cross-sectional area at the rear than at the forward end, an axial channel through said valve communicating between the ingressopening and a counter-pressure chamber in the valve-casing at the rear of the main valve, a relief-channel communicating between the counter-pressure chamber and the egressopening and of larger, capacity than the firstnamed channel, a relief-valve controlling the relief-channel and held normally seated by a spring-actuated plate mounted within the counter-pressure chamber,and an exteriorlyoperable plunger whereby the relief-valve may be unseated.

3. A valve comprising a casing provided with ingress and egress openings, a main valve controlling an ingress-opening and of larger cross-sectional area at the rear than at the forward end, an axial channel through said valve communicating between the ingressopening and a counter-pressure chamber in the valve-casing to the rear of the main valve, a relief-channel communicating between the counter-pressure chamber and the egressopening of larger capacity than the axial channel, a reliefivalve controlling said reliefchannel and held normally seated by a springactuated plate carried by a stem guided for longitudinally-reciprocal movement within the axial channel of the valve, and an exteriorly-operable plunger whereby the reliefvalve may be unseated and the plunger-stem reciprocated within the axial channel.

In testimony whereof I have affixed my signature in presence of two witnesses.

EDOUARD SGHLAEPFER. Witnesses:

EDWARD VON WALDKIRCH, ADOLF FEDERER. 

